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ANDREW "3. VA ND scalar, or CINGINNATL, OHIO.,

-L'eaers Patent Nq. 71,342,4'f1ateaNovemba 2o, 1867. Y

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Be it known that I, ANDREW J. VANDEeRIFr, of the city of Cincinnati, county of` Hamilton, and State of Ohio, h'ave invented a new and useful Mechanical Movement for the purpose of moving a plane perpendicular,

and at the sametime preserving a parallel with its originalposition, the samebeing vapplicable to 'parallefrnles 1 and an indefinite number of other mechanical uses; and I do hereby declare the following is a full, clear, and

exact description of the construction. and operation of the same, as applied to parallel rules suitable for the use of draughtsmen and others, reference being hadto th'e annexed drawings, making a part of this specification, in which- Figure 1 is an elevationof the apparatus, representing it contracted or closed. Figure 2 is an elevation, representing the apparatus as extended or expanded- Figure 3 is an inverted side elevation of one of the stocks, or one of the movable halves of the rule. Similar letters Vof reference indicate corresponding parts in the several gures.

` y This invention relates to that class of movements for the purpose of moving a parallel plane from` itstbase,` or from another line lor plane, and at the same time preserve a true parallel with the same, it being desirable, if t i not essentially necessary, in most cases,where such movement is applicable in mechanics, to preserve a perpens` t dicular, as well as a parallel, with rigidity; and the same having wndt been heretofore done, this invention is designed for that purpose, To enable others skilled in the art t o fully understand and construct my invention, I will proceed to describe it as applied and used'in parallel rules. I t A and B, figs. 1 and'2, are the two wooden stocks or movable planes, represented as having their sides cut away, for the purpose of exhibiting the peculiar construction and arrangement of the` moving system of levers,`

by which the desired object is accomplished. C and D are two levers-which cross each other, having a common;`

fulcrum or centre, a, formed by a rivet. I, J, K, and L, figs. 1 and 2, are short levers, hinged in such aman# n'er as to oscillate on centre-pins on rivets c,` d, e, and j', said rivets heing fastened permanently in the stocks A v and B, and forming the fulcra of the aforesaid levers. E, F, G, and H are tension-rods,teach being attached,

at one end, to the inside arm of one of levers I, J, K, and L, and at the other-'end in like mannerto the outside` arm, by riveting, in such a manner as to. form a hinge, so that each lever may bevallowed to `revolve or os'c'illate on its centre, thus: levers I and J, figs. 1 and 2, beinglsecured to wooden stock A, respectively, by rivets e and e passing through their respective centres, are held in corresponding relation tothe main centre a, gs. 1 and 2, by means of tension-rods E and-F-being so attached as to connect the-inside arm of one of said levers to the i outside arm of the other, so that when the apparatus is closed or contracted, the inside arms of said levers are thrown outward, as shown in iig. 1, and when the apparatus is expanded orextended, the Yinside arms of said levers are thrown in towards the centre, as shown in iig. 2. Levers K and L, and tension-rods G and H opere ating in like manner, and the inside armsfof levers I, J, K, and L being attached to the four arms of levers O t t i i andD, as shown plainly in figs. 1 and 2, it will be readily seen and understood that the apparatus so arranged i and constructed is capable of being contracted and expanded, as shown in figs. 1 and 2. The object of the arrangement of tension-rods E and F with levers I and J, connecting the inside arm of one of said levers with the outside arm of the other, and vice versa, and tensionrods G and H with levers K- `and L; in like manner,

is to furnish a compensating movement, in order to give the arms of levers C and D freedom of motion, while describing, as they do, an are of a circle, by the apparatus being opened or closed, without changing the points of attachment to the stocks; that is, .the centres of lever I and J with each other, and the centres of K and L with each other in such a manner as at the same time to preventsaid stocks from `rocking longitudinally on said f i l levers, which would be the case were they not thus attached to each other by said rods. n p

I have thus described thc arrangement and operation of this movementas applied to parallelzrulesg,,but-tit is equally capable of various applications in the mechanical arts; andsen-long as `the systemzof levclrs snhstan tally as herein described is used'for the purpose of preservinr a perpendicular as well asiaiparallel` lineiinthe U movement, I shall consider it an infringement upon my invention. l 'I vHaving thus fully described the arrangement and operation of 'lnyinvcntinN-Yhat I claim therein will,

`and desire to secure by Letters Patent, is

The system of levers described, when `arranged and operated sulnstantially in the umnner'and forv the purpose set forth.

2. The tension-rods described, or their equivalents, when arranged and operated in connection with the levers described, substantially in the manner and for the purpose set forth.

3. The system of leversand tension-rods, combined wth'and attached to stocks or planes A and B, or their equivalents, by the means, in the manner, and for the' purpose substantially as set forth and described.

A.' J. VANDEGRIFT.

Witnesses:

JOHN H. BOGART, SAMUEL R. RUSSELL. 

